This study examines the following two premises of information-seeking behavior associated with the use of nonfiction books in an electronic mode: (1) individuals generally read nonfiction books for obtaining information; and (2) users read nonfiction books in parts, rather than completely. Study data were collected through interviews with 350 patrons who borrowed nonfiction books at five of the libraries in a metropolitan public library system in Ohio. The premise that patrons consult nonfiction books mainly for obtaining information was supported by the data; and the premise that nonfiction books are read in parts was found to be true of two-thirds of all use. Study findings also suggest that electronic information systems should offer a subject approach and should allow rapid scanning and skipping through text in nonfiction books. The study research, findings on premises of electronic information systems, and findings on characteristics of nonfiction book readers and implications for electronic information systems are detailed. The text is supplemented with 6 figures, including the interview script, and 34 tables; statistical notes and 7 tables are appended; and 6 references are provided. Ordering information for Online Computer Library Center, Inc. (OCLC) publications is also provided. (KM)